Interaction between internal and external defects on pipelines and its effect on failure pressure

Zhang, Zhuwu; Guo, Liping; Cheng, Y. Frank

doi:10.1016/j.tws.2020.107230

Cited by 23 publications

(3 citation statements)

References 21 publications

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“…Alizadeh et al [ 5 ] reported that greater crack width caused lower critical pressures and that an external crack had more influence on the vessel’s capacity than an internal crack of the same configuration. Zhang et al [ 6 ] found that the failure pressure of a pipeline depended on both the longitudinal spacing between internal and external defects and the ratio of the internal defect depth to pipe wall thickness when both external and internal defects were present. Usually, the special opening load and opening mode of frangible covers are realized by creating weak areas in their relative locations.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a New Multi-Part Composite Frangible Cover

Yuan

Wang

et al. 2023

Polymers

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In this paper, a new multi-part composite frangible cover (MCFC) was designed and fabricated. The frangible cover, manufactured with a traditional manual lay-up method, is designed to conduct a simulated missile launch test using a specially developed test device. A weak zone structure of the composite multi-part frangible cover was designed, and the separation process of the cover was studied by numerical simulation. Based on the strength envelope of the weak zone and the equal-strength design principle, a design method for the weak zone structure of the composite multi-part frangible cover was proposed. A finite element model of the composite multi-part frangible cover was established, and the separation process was numerically simulated and analyzed. Afterward, the verification experiments were carried out. Close agreements between the numerical and experimental results are observed.

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Section: Introductionmentioning

confidence: 99%

Design and Analysis of a New Multi-Part Composite Frangible Cover

Yuan

Wang

et al. 2023

Polymers

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“…Corrosion results in material loss, which is one of the important causes for pipeline failure and explosion. [1,2] For both marine and buried pipelines, their internal and external walls could be corroded. [3][4][5][6][7][8][9][10][11] Acidic red soil, a typical soil in southeastern China, is characterized by the high content of clay minerals, high bond degree of texture, and high resistivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of external wall defect growth on internal wall corrosion of oil pipelines under mechano‐electrochemical interaction

Zhang

Ding

2022

Can J Chem Eng

Self Cite

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The corrosion mechanism of X80 steel in simulated solutions of acid red soil and product oil sediment under mechano‐electrochemical interaction (MEI) was researched to build a new finite element model through multi‐physical field coupling simulation technology. Based on the new model, the effect of external wall defect growth on the internal wall corrosion of oil pipelines was analyzed in detail. The results showed that the distributions of stress and corrosion of the internal wall were extremely affected by the external wall defect depth, and the corrosion rate of the internal wall was enlarged remarkably by the external wall defect growth. Moreover, attributing to the local galvanic cell effect under MEI, the growth rates of corrosion defects in the depth and length directions of the external defect were accelerated because these directions were associated with larger stress and equivalent to the anode, but the corrosion rate in the width direction of the external defect was inhibited because this direction was associated with smaller stress and equivalent to the cathode.

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“…Circular tubes are widely used as components in various applications, including buckets, columns for buildings, shafts, poles, and oil storage tanks. Many researchers have studied circular tubes, in an attempt to increase their strengths and lowering the associated waste by improving the structures of tubes [1][2][3][4][5][6][7]. These structures comprised sandwiched sinusoidal lateral corrugated tubes and circular braided composite tubes, among others.…”

Section: Introductionmentioning

confidence: 99%

Optimized Design of Structure of High-Bending-Rigidity Circular Tube

2021

Sustainability

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Circular tubes are widely used in daily life and manufacture under bending load. The structural parameters of a circular tube, such as its wall thickness, number and shapes of ribs, and supporting flanges, are closely related to the tube’s bending rigidity. In this study, a tube with eight ribs and a flange was optimized, in order to obtain the lowest weight, through comprehensive structural optimization. We obtained the optimal structural parameters of the tube and the influence of the structural parameters on the tube’s weight. The structural parameters of tubes with different numbers of ribs were optimized. The tube with different number of ribs had the same inner diameter, bending load, and length as the tube with eight ribs. We conducted an experiment to verify the structural optimization simulation. Different tube sizes were subsequently optimized. The optimized tube with four trapezoidal ribs and a flange reduced the weight by more than 73% while maintaining the same deformation. The weight of the optimized tube with a flange reached a stable value after four trapezoidal ribs were added. When the number of ribs was two, the weight was the largest. The analysis results were consistent with the numerical results. A new AWATR (appropriate width and thickness of ribs can improve the bending rigidity of the tubes) formula was proposed, which can effectively improve the bending rigidity of tubes. Different shapes of tubes were optimized and compared. The optimized tube with four trapezoidal ribs and a flange was the lightest and easy to manufacture.

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Interaction between internal and external defects on pipelines and its effect on failure pressure

Cited by 23 publications

References 21 publications

Design and Analysis of a New Multi-Part Composite Frangible Cover

Design and Analysis of a New Multi-Part Composite Frangible Cover

Effect of external wall defect growth on internal wall corrosion of oil pipelines under mechano‐electrochemical interaction

Optimized Design of Structure of High-Bending-Rigidity Circular Tube

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